Smokestack



Dec. 12, 1933.

H. "r. DYER v 1,939,254

SMOKESTACK Filed Oct. 26, 1932 4 sheets-Sheet 1 FIG. I. 0;

' Ti i j FIG. 2.

FIG 4.

INVENTOR Dec. 12, 1933. DYER 1,939,254

SMOKESTACK F-iled Oct. 26, 1932 4 Sheets-Sheet 2 FIG. 6.

FIG. 7'

INVENTOR Dec. 12, 1933. H. T. DYER r 1,939,254

SMOKESTACK Filed Oct. 26, 1932 4 Sheets-Sheet 3 FIG. .9.

FIG. 10.

INVENTOR TTORNEY Dec. 12, 1933. H. T. DYER 1,939,254

SMOKESTACK Filed Oct. 26, 1932 4 Sheets-Sheet 4 FIG.

INVENTOR ATTORNEY Patented Dec. 12, 1933 UNITED STATES r OFFICE 12 Claims.

7 My invention is designed to provide a construction which is designed primarily for ships which will have the effect of preventing the products of combustion, emitted by the stack, from immediately traveling in a downward direction after they emerge from the stack.

My invention relates more particularly to smoke stacks for ships although it will be apparent to those skilled in the art that it might be applied with more or less efiiciency to any type of smoke stack where it is desired to cause the products of combustion to ascend upwardly upon emerging from the stack. 7

It is well known in the older type of ships where the stacks were comparatively taller and, many in number that the smoke etc., was carried upwardly with suflicient velocity to keep the decks of the vessel comparatively free from cinders and the disagreeable gases emitted from the stack. In the modern type of vessel, howevenin which the stacks are sometimes built very low the gases and other products of combustion upon emergence from the stack travel downwardly at the rear of the stack, along the deck and have even been known to travel into the passageways leading to the cabins and travel forwardly in these passageways with very disagreeable results to the passengers. These stacks comprise an outer stack and an inner main stack which is connected to the boiler to carry the products of combustion the ship to the space intermediate the walls of the outer stack and the main stack to permit the escape of the heated air from the ship. It is vent the rain from entering this space interme diate the inner stack and the outer stack, yet the ventilation" must be maintained.

My invention has for its principal object to provide a construction for stacks which will entirely eliminate the tendency of the gases and other products of combustion to act in this objectionable manner and which will also insure their traveling in an upwardly direction until they have entirely cleared the ship. I have found in practice that by the use of my improvement applied to the stack of a ship that I am able to maintain these very desirable results while the Wind is more or less ahead. v

My means for accomplishing the foregoing object may be more readily understood by having reference to the accompanying drawings which are hereunto annexed and made a part hereof, in which Fig. 1 is a diagrammatic outline of a ship, the

the main stack is preferably formed on stream wellfknown that provision has to be made to preat the point where it starts to converge.

them wider.

sections the forward section being shown on the left hand and the after sections on the right hand of said diagram; V

Fig. 8 is a diagram of a modified form. for the lines and offsets for the buttocks for the stack Fig. 9 is a diagram of a modified form of the top plan view of the same; I

Fig; 10' is a diagram of a modified form of the forward and'after sections, the forward section being shownon the left hand and the after sections on the right hand of said diagram; and

Fig. 11 is a vertical sectional view through a fragmentary portion of the outer and inner stacks adjacent the top.

' Similar reference numerals refer to similar .parts throughout the entire description. 35 away. It is customary to connect the interior of As shown in the drawings the stack comprises an outer stack 1 and an inner or main stack 2. The outerstack which is very much larger than lines. jAs' clearly seen in the'charts, or diagrams, the walls 3 of the outer stack adjacent the top converge inwardly, upon the lines and offsets clearly seen in the diagrams in Figs. 5, 6 and 7, until they reach the plane ofthe main stack It has, been found that this construction produces an effect similar to an induced draft, by reason of the increase of the velocity of the air over the. top of the stack which pro- ;duces' a decrease in the static pressure over the top of the stack. g

At a point where the outer stack 1 begins to converge inwardly, I mount two outwardly and. rearwardly extending horizontal fins 4 and 5. The combined width of these fins should preferably be equal to the diameter of the outer stack Though in some cases it may be found desirable to have The fins 4 and 5 are divided by a central vertical fin 6 which extends from the converging portions 3 and the top of the main stack 2 to the after termination of the outer stack 1. As shown in Fig. 6 these converging sections are brought in with a concave curvature as clearly seen in Fig. 6. This construction is most efiicient in practice. 7

I have found in practice that the converging sections 3 may also be formed as shown in the diagrams, Figs. 8, 9 and 10, in which each converging section conforms precisely to the stream line configuration of the outer stack, the concave curvature being dispensed with.

I have also found in practice that when the smoke stack of a ship is constructed, following the diagrams as shown in the drawings that the space 10 may be partially closed off by means of the converging section 3 at the forward part of the" stack and a wall 11 at the rear of the main stack 2. A short sleeve 12 is secured to the top 13 of the main stack 2 in any suitable or desired manner and extends almost to the top of the inwardly converging sections 3. Although I have shown a sleeve secured to the stack it will be clear to persons skilled in the art that the stack itself may be carried up to the desired plane instead of using aseparate sleeve. The sections 3 are carried inwardly as at 14 until theyform an opening 15 which constitutes the outlet of the stacks being in register with the outlet of the inner stack 2 and corresponding to its diameter but leaves a passageway intermediate the sleeve 12 and this outlet. This effectuallyprevents the rain from enteringinto the ventilating space and it also servesto cause the escape of the products of combustiomfrom the main stack 2, to act on the principle of an ejector and draw the air from the space 10 out of the opening 15 at thetop of the outer stack.

a Although I have shown and described specific details of construction I have done so solely for the purpose of illustrating a preferred embodiment of my .inventionwhich I have found in actual use attains the desired results, but. such illustrations and drawings are not to be taken as limitations for I do not desirev tobe limited,v

either by the drawingsor the terminology employed, to such details of construction except as such limitations may appear in the hereinafter contained claims.

Having described my invention what Iregard new and desire to secure by Letters Patent is:

1. A smoke stackv comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, a main stack inside of said outer stack,fthe portion of said outer stack adjacent its top converging smoothly convexly upwardly and inwardly to form an outlet I which corresponds to the diameter of the main stack whereby the products of combustion will t travel upwardly until they have cleared the ship.

2. A, smoke stack, comprising an outer stack,

the forward walls being rounded in section and then tapering, rearwardly forming. what is commonly termed a stream line section, a main stack insideof said outer stack, said outer stack curving smoothly convexly upwardly and inwardlyin such manner that a plurality of superposed sections taken through said curve, and parallel to each other and horizontal are successively smaller in plane and slanting inwardly at said rear portion of said stack until an outlet is formed which corresponds to the outlet of the main stack.

3. A smoke stack comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly forming what is com-- monly termed a stream line section, a main stack inside of said outer stack, said outer stack curving smoothly convexly upwardly and inwardly in such manner that a plurality of superposed sections taken through said curve and parallel to each other and horizontal are successively smaller in plane and slanting inwardly at said rear portionof said stack until an outlet is formed which corresponds to the outlet of the main stack, a vertical fin which corresponds in height to the inclined sections of the outer stack, which fin extends from the converging portions of the outer stack to the rear of said outer stack and a pair of horizontal fins, one at each side of said vertical fin, located at the section where the walls of the outer stack start to converge.

'4. A smoke stack comprising an outer stack,

to form outlet which corresponds to the di ameter of the main stack, a vertical fin which corresponds in height to the inwardly converging portion of the outer stack, which fin extends from,

the converging portions of the outer stack to the rear of said outer stack and a pair of horizontal fins, one at each of said vertical fin.

5. A smoke stack comprising an outer stack,

the forward walls being rounded in section and,

then tapering rearwardly forming what is commonly termed a stream line section, a main stack inside" of said outer stack, said outer stack curv ing smoothly convexly upwardly and inwardly in such manner that a'plurality of superposed sec-.

tions taken through said curve and parallel to' ing portions of the outer stack, a vertical fin cor-.

responding in height to the inclined sections of the outer stack which fin extends from the opening'of the converging portions of the outer stack to therear of said outer stack and a pair'of horizontal fins one'at each side of said vertical fin.

6. A smoke stack comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, a main stack inside of said outer stack, the portion of said outer stack adjacent its top converging inwardly to form an outlet which corresponds to the diameter of the main stack, a vertical fin which corresponds in height to the inwardly converging portion of the outer stack, which fin extends from theopening of said converging portions of the outer stack to the rear of said outer stack and a pair of horizontal fins, one at each side of said vertical fin, and a sleeve mounted in the top of the main stack, therebeing an annular space intermediate said sleeve and said outer stack,

the end of said sleeve being spaced from the aperture formed by the converging portions of the outer stack.

7. A smoke stack comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly, forming what is commonly termed a stream line section, a main stack inside of said outer stack, the portion of said outer stack adjacent its top converging inwardly to form an outlet which corresponds to the diameter of the main stack, and a sleeve mounted at the top of the main stack, there being an annular space intermediate said sleeve and said outer stack, the end of said sleeve being spaced from the outlet formed by the converging portions of the outer stack.

8. A smoke stack comprising an outer and inner stack, spaced from each other, the portion of the outer stack adjacent its top converging inwardly to form an outlet which corresponds to the diameter of the inner stack.

9. A smoke stack comprising an outer and inner stack, spaced from each other, the forward walls of the outer stack being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, the portion of said outer stack adjacent its top curving inwardly to form an outlet which corresponds to the diameter of the inner stack and in register therewith, the end of the inner stack extending to a plane adjacent the outlet formed by the inwardly curving portion of the outer stack but spaced therefrom.

10. A smoke stack comprising an outer and inner stack spaced from each other, the forward walls of the outer stack being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, the

portion of said outer stack adjacent its top curving inwardly to form an outlet which is in register with the inner stack and corresponds to the diameter thereof, the end of said inner stack extending to a plane adjacent the outlet formed by inwardly curving portion of the outer stack but spaced therefrom, a vertical fin which extends rearwardly from the curved portion and a pair of horizontal fins one at each side of the vertical fin.

11. A smoke stack comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, a main stack inside of said outer stack, the portion of said outer stack adjacent its top converging inwardly to form an outlet which correspondsto the diameter of the main stack, a vertical fin which extends rearwardly from said converging portion, and a pair of horizontal fins one at each side of the vertical fin.

12. A smoke stack, comprising an outer stack, the forward walls being rounded in section and then tapering rearwardly forming what is commonly termed a stream line section, a main stack inside of said outer stack, said outer stack curving smoothly convexly upwardly and inwardly in such manner that a plurality of superposed sections taken through said curve and parallel to each other and horizontal are successively smaller in plane and slanting inwardly at said rear portion of said stack until an outlet is formed which corresponds to the outlet of the main stack, a vertical fin which extends rearwardly from said slanting sections, and a pair of horizontal fins, one

each side of the vertical fin.

HORACE T. DYER. 

